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Cyclic oxidation of high-silicon spheroidal graphite iron

Ebel, André and Marsan, Olivier and Lacaze, Jacques and Malard, Benoît Cyclic oxidation of high-silicon spheroidal graphite iron. (2021) Corrosion Science, 192. 109854. ISSN 0010-938X

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Official URL: https://doi.org/10.1016/j.corsci.2021.109854

Abstract

In service, automotive exhaust manifolds are submitted to rapid thermal cycling up to 700–750 °C. To simulate an increase in exhaust gas temperature, a high-silicon cast iron was tested for rapid thermal cycling up to 800 °C. In addition to the well-known duplex oxide scale, rapid cyclic oxidation promotes the formation of a columnar zone at the substrate/oxide interface that has never been reported. It is evidenced that this columnar zone proceeds from a repetitive process. Based on detailed metallographic analysis using optical observations, in-situ XRD, micro-analyses and Raman spectroscopy, a mechanism explaining the formation of this columnar zone is proposed.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:07 Mar 2022 10:41

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